/* 
  MD5 Message-Digest Algorithm - JavaScript
  MODIFICATION HISTORY:
  1.0 16-Feb-2001 - Phil Fresle (<A href="mailto:sales@frez.co.uk">sales@frez.co.uk</A>) - Initial Version (VB/ASP code)
  1.0 21-Feb-2001 - Enrico Mosanghini (<A href="mailto:erik504@yahoo.com">erik504@yahoo.com</A>) - JavaScript porting
*/
function MD5(sMessage){
  function RotateLeft(lValue, iShiftBits){ 
    return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits)); 
  }
  function AddUnsigned(lX,lY){
    var lX4,lY4,lX8,lY8,lResult;
    lX8 = (lX & 0x80000000);
	lY8 = (lY & 0x80000000);
	lX4 = (lX & 0x40000000);
	lY4 = (lY & 0x40000000);
	lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
	if (lX4 & lY4) return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
	if (lX4 | lY4) {
	  if (lResult & 0x40000000) 
	  	return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
	  else 
	  	return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
	}else {
	  return (lResult ^ lX8 ^ lY8);
	}
  }
  function F(x,y,z) { return (x & y) | ((~x) & z); }
  function G(x,y,z) { return (x & z) | (y & (~z)); }
  function H(x,y,z) { return (x ^ y ^ z); }
  function I(x,y,z) { return (y ^ (x | (~z))); }
  function FF(a,b,c,d,x,s,ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  }
  function GG(a,b,c,d,x,s,ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  }
  function HH(a,b,c,d,x,s,ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  }
  function II(a,b,c,d,x,s,ac) {
    a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
    return AddUnsigned(RotateLeft(a, s), b);
  }
  function ConvertToWordArray(sMessage) {
    var lWordCount;
    var lMessageLength = sMessage.length;
    var lNumberOfWords_temp1=lMessageLength + 8;
    var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
    var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
    var lWordArray=Array(lNumberOfWords-1);
	var lBytePosition = 0;
	var lByteCount = 0;
	while ( lByteCount < lMessageLength ) {
	  lWordCount = (lByteCount-(lByteCount % 4))/4;
	  lBytePosition = (lByteCount % 4)*8;
	  lWordArray[lWordCount] = (lWordArray[lWordCount] | (sMessage.charCodeAt(lByteCount)<<lBytePosition));
	  lByteCount++;
	}
	lWordCount = (lByteCount-(lByteCount % 4))/4;
	lBytePosition = (lByteCount % 4)*8;
	lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
	lWordArray[lNumberOfWords-2] = lMessageLength<<3;
	lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
	return lWordArray;
  }
  function WordToHex(lValue) {
	var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
	for (lCount = 0;lCount<=3;lCount++) {
	  lByte = (lValue>>>(lCount*8)) & 255;
      WordToHexValue_temp = "0" + lByte.toString(16);
      WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
    }
    return WordToHexValue;
  }
  var x=Array();
  var k,AA,BB,CC,DD,a,b,c,d
  var S11=7, S12=12, S13=17, S14=22;
  var S21=5, S22=9 , S23=14, S24=20;
  var S31=4, S32=11, S33=16, S34=23;
  var S41=6, S42=10, S43=15, S44=21;
  // Steps 1 and 2. Append padding bits and length and convert to words
  x = ConvertToWordArray(sMessage);
  // Step 3. Initialise
  a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
  // Step 4. Process the message in 16-word blocks
  for (k=0;k<x.length;k+=16) {
    AA=a; BB=b; CC=c; DD=d;
    a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
    d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
	c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
	b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
	a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
	d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
	c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
	b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
	a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
	d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
	c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
	b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
	a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
	d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
	c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
	b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
	a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
	d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
	c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
	b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
	a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
	d=GG(d,a,b,c,x[k+10],S22,0x2441453);
	c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
	b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
	a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
	d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
	c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
	b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
	a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
	d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
	c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
	b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
	a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
	d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
	c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
	b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
	a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
	d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
	c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
	b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
	a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
	d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
	c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
	b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
	a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
	d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
	c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
	b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
	a=II(a,b,c,d,x[k+0], S41,0xF4292244);
	d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
	c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
	b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
	a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
	d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
	c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
	b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
	a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
	d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
	c=II(c,d,a,b,x[k+6], S43,0xA3014314);
	b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
	a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
	d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
	c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
	b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
	a=AddUnsigned(a,AA); b=AddUnsigned(b,BB); c=AddUnsigned(c,CC); d=AddUnsigned(d,DD);
  }
  // Step 5. Output the 128 bit digest
  var temp= WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
  return temp.toLowerCase();
}